many small fixes, RU lang

src/core/scene/glscene.h

@@ -56,7 +56,7 @@ public:
 	/// Add object \"o\" to scene and take its ownership
 	/// All materials and geometries used by \"o\" tree
 	/// copied into this scene
-	void addObject(ObjectBase * o);
+	void addObject(ObjectBase * o, ObjectBase * parent = nullptr);
 
 	void addScene(const Scene * s);
 	void assignFrom(const Scene * s);